Viessmann 7856786 Flow Switch

Product Description

The VIESSMANN 7856786 is a flow switch designed to detect liquid movement within a hydronic or heating system. Flow switches of this type serve as a safety interlock, confirming that adequate water flow is present before allowing a boiler or heating appliance to fire. The 7856786 is identified by its type 325 M 600 designation and is suited for installation by licensed HVAC technicians or plumbers working on commercial or residential heating systems. It provides a simple, reliable signal to the system controller based on flow status.

This flow switch is intended for use in hydronic heating applications where water flow verification is required as part of safe system operation. The part description references compatibility with B1XE series appliances rated at 150 to 199 thousand BTU/h output, making it appropriate for mid-range boiler installations. It is typically installed in the supply or return piping to monitor flow before the burner sequence is permitted to proceed.

Key Features

• Flow detection designed to serve as a safety interlock in hydronic heating systems
• Type 325 M 600 designation for precise OEM identification
• Compatible with B1XE series appliance range based on supplier description
• Provides flow status signal to system controller or burner management circuit

Compatibility

Referenced in supplier data for use with B1XE series appliances in the 150 to 199 thousand BTU/h range. No additional specific model numbers were provided in the product data. Verify compatibility with the OEM documentation for your specific VIESSMANN appliance before ordering.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician familiar with hydronic piping systems. Shut off system power and isolate water pressure before removing or installing any flow switch. Follow local mechanical codes and the appliance manufacturer wiring instructions when connecting the switch to the control circuit. Confirm proper flow direction orientation against the arrow or marking on the switch body during installation.

Technical Specifications

• Part Type: Flow Switch
• Model Designation: Type 325 M 600
• Application Range: B1XE 150/199

Standard Information

• Brand: VIESSMANN
• Manufacturer Part Number: 7856786